The aim I have is to be impartial (9)
I believe the answer is:
objective
'to be impartial' is the definition.
(thesaurus)
'the aim i have' is the wordplay.
'the aim' becomes 'object' ('object' can be a synonym of 'aim').
'i have' becomes 'I've' (contraction of 'I have').
'object'+'ive'='OBJECTIVE'
'is' is the link.
(Other definitions for objective that I've seen before include "Aim - impartial" , "relating to external phenomena" , "end" , "Not showing any bias" , "for neither side" .)